Pulverizing machine



Oct. 8, 1935. Y ci agg AL 2,016,497

PULVERIZING MACHINE Original Filed Oct. 29, 1932 INVENTORS. H05 7-7/1 4. IML BECK.

1m van 1''. IML EEC/f.

Malia, fi/uam & M

ATTORNEYS.

ficient in operation.

Patented Oct. 8, 1935 PATENT OFFICE PULVEBIZIN G MACHINE Austin a.

I Iolbeck, Long Lake, Mich, and Halvor h. Holbeck, Lakewood, Ohio Original application October 29, 1932, Serial No.

640,204. Divided and this application April 24,

1935, Serial No.- 18,026

5 Claims. (0!. 83-11) This invention relates to pulverizing apparatus, and, as its principal object, aims to provide an improved pulverizing machine which is of very compact construction and which is very ef- Another object of our invention is to provide an improved pulverizing machine of the multiple zone type wherein the pulverizing rotors are so arranged that the material is fed to the rotors in succession at the periphery thereof and passes through each rotor in opposition to centrifugal orce.

A further object of our invention is to provide a pulverizing machine of the multiple zone type wherein the pulverizing rotor of each zone is in close running relation to one wall of the zone around a discharge opening therein and is spaced from the other wall of the zone to provide a passage for feeding the material to be pulverized to the periphery of the rotor, whereby the material passes through the rotors in succession and passes through each rotor in opposition to centrifugal force.

More specifically, it is an object of the present invention to provide an improved pulverizing machine of the type embodying fan and pulverizing chambers separated by a partition having a connecting opening, wherein a rotor operable in the pulverizing chamber has axially extending impact elements connected by a ring which is disposed in close running relation to the partition. This application is a division of our copending original application Serial No. 640,204, filed October 29, 1932.

The invention may .be further briefly summarized as consisting incertain novel combinations and arrangements of parts hereinafter described and particularly set out in the appended claims.

In the accompanying sheet of drawings,

Fig. l is a longitudinal sectional view ofka pulverizing machine embodying, our invention; and

Fig. 2 is a transverse sectional view thereof taken substantially on line 22 of Fig. l.

Detailed reference will now be made to the accompanying drawing illustrating a preferred form of the pulverizing apparatus of our invention Before proceeding with such detailed de-' scription, it should be understood, however, that our invention is not. to be regarded as limited to the particular structural arrangements herein disclosed, but may be embodied in various other achines or apparatus. v

In the drawing we have shown a pulverizing machine which is constructed accordingto our invention and which is provided with a housing 48 having pulverizing zones 49 and 50 therein and a fan chamber 5| from which the pulverized material is delivered through the tangential delivery nozzle 52. The housing isprovided at one end 5 thereof with a removable cover 53 having an inlet opening 54 through which material to be pulverized may be fed andthrough which air is drawn by rotation of the fan 55 in the fan chamber 5!.

, To form the pulverizing zones 49 and 50, we 10 provide the housing with a substantially cylindrical liner 56 having an integral partition wall 51* between the pulverizing zones. This liner.may be retained in place in the housing by means of the removable cover 53. Pulverizing rotors 58 and -5 59 operate in the pulverizing zones 49 and 50, and are connected to a drive shaft 60 to which the fan 55 is also connected. This shaft extends longitudinally of the housing and may be driven by any suitable power means, such as the electric 20 motor 5|. The partition wall 51 is provided with a central opening 62 around the shaft 60 which opening connects the pulverizing zone 49 with the pulverizing zone 50. A similar opening 63 is formed in the partition wall 64 which is located 25 between the pulverizing zone 50 and the fan chamber 5|, such opening providing a discharge passage for the delivery of pulverized material from the pulverizing zone 50 to the fan chamber.

According to our invention, the pulverizing rotor 58 is disposed in close running relation to the partition 51 around the opening 62 provided in this partition. This rotor is preferably in the form of a hollow structure having axially spaced 35 disk and ring portions or member 65 and -$6, and also having a plurality of circumferentially spaced axially extending crushing elements 61 disposed between these members at the outer edge thereof. The ring memberfifi is in close runningrela- 40 tion to the partition 51 and is provided with a central opening 68 which registers with the opening 62 of the partition. The disk portion 65 is drivingly "connected with the shaft 50 and is spaced from the cover 53 to provide a passage for feeding the material to the-rotor from the inlet opening 54. The material in the passage 69 is fed to 'the rotor through the annular space 10 extending between the crushing elements 61 and the corrugated inner surface 1| of the liner 5 56. The material entering this space is subjected to a crushing action between the element 61 and the liner until the material is rendered sufficiently fine to be drawn in through the rotor, in op- 55 position to centrifugal force, by the flow of air created by the fan 55.

The-pulverization rotor 59, which operates in the pulverizing zone 56, is disposed in close running relation with the partition 64 so that the material which is delivered to the fan chamber through the passage 63 must first pass through this pulverizing rotor. prises axially spaced disk and ring'portions or members 12 and 13, and a plurality of circumferentially spaced crushing elements 14 extending between the disk and ring portions around their outer edge. The ring portions 13 is in close running relation to the partition 64 and is provided with a central opening 15 which'registers substantially with the opening 63 leading into the fan chamber. The disk portion 12 is drivingly connected with the shaft 60 and is spaced from the partition wa1l'5l to provide a passage 16 for feeding material to the rotor. As shown in Fig. 1, the passage 16 connects the opening 62 of the partition 51 with the annular space 11 extending around between the crushing elements 14 and the corrugated inner surface of the liner 56 so that material delivered from the pulverizing'rotor 58 will be supplied to the pulverizing rotor 59. The material being supplied to the rotor 59 enters the annular space 11 and is subjected to a crushing action between the elements 14 and the corrugated liner, and when this material has been rendered sufficiently fine, it is drawn in through the spaces between the crushing elements 14, in opposition to centrifugal force, by the stream of air created by the fan. This finely pulverized material passes with the air stream into the fan chamber 5| through the opening 63 and is delivered from the fan chamber through the nozzle 52.

If desired, the liner- 56 may be mounted in the housing in such a manner as to provide a space 18 therebetween for the collection of tramp metal or other hard foreign bodies. The pocket formed by the space 18 may be connected with the lower end of the inlet passage 69 by means of the laterally extending opening 19.

From the foregoing description and the accompanying drawing, it should now be readily understood that we have provided a compact and efficient form of pulverizing machine which embodies a plurality of pulverizing zones and wherein the rotors of the pulverizing zones are so arranged thatthe material to be crushed passes through the rotors in succession and passes The rotor itself com-' through each rotor in opposition to centrifugal" force. In the arrangement which we have provided, the passage of the material through each crushing zone in opposition to centrifugal force results in the most efiicient and thorough pulverizing action being obtained in each'zone, since only the finely pulverized particles can be withdrawn from the pulverizing zones by the air stream. By thus providing a pulverizing machine wherein the most efiicient pulverizing action ob- In addition to-the foregoing advantages, it will be seen that the ring member which connects the X axially extending impact elements of each pulverizing rotor operates in close running relation to a partition and thus prevents material from passing the rotors without being pulverized.

.While we have illustrated and described the 5 pulverizing apparatus of our invention in a detailed manner, it should be understood, however, that we do not wish to be limited to the precise details of construction and arrangement of parts illustrated and described, but regard our inven-m tion as including such changes and modifications I as do not involve a departure from the spirit of the invention and the scopeof the' appended claims.

Having thus described our invention, we claim: 15

l.- In a pulverizing machine, the combination of a housing havinga fan chamber-and a pulverizing chamber with a partition therebetween, said partition having an opening substantially centrally thereof for connecting said chambers, a 20 fanin the fan chamber, a rotor in the pulverizing chamber having a disk portion and circumferentially spaced impact elements extending substantially axially therefrom, annularly extending pulverizing means in said housing for cooperation 25 with said impact elements, a ring connecting said elements and disposed in close running relation to said partition around the opening therein, the disk portion of said rotor being spaced from the inlet end of the pulverizing chamber to provide 30 a substantially unobstructed passage for feeding material to the impact elements of said rotor, and means for actuating said rotor and said fan.

2. In a pulverizing machine the combination of a housing having axially spaced walls dividing 35 the interior of the housing into a plurality of chambers including a pair of pulverizing chambers and a fan chamber, rotors for said chambers including a hollow pulverizing rotor in each pulverizing chamber and a fan in said fan cham- 0 her, means for driving said rotors, one of said walls having an opening therein connecting the pulverizing chambers and another wall having an opening therein connecting one of the pulverizing chambers with the fan chamber, each pulverizing 45 rotor comprising adisk having substantially axially extending circumferentially spaced impact elements and a ring connecting said elements, said pulverizing rotors being disposed with the disks thereof spaced from certain of said walls to 50 provide passages for feeding material to the rotors and with the rings thereof in close running relation to the walls having openings therein, and annularly extending pulverizing means in the housing for cooperation ,with the impact elements 55 of the respective rotors.

3. In a pulverizing machine, the combination of a housing having a fan chamber and a pulverizing chamber with a partition therebetween, said pantition having an opening substantially centrally 0 thereof for connecting said chambers, a fan in the fan chamber, a rotor in the pulverizing chamber having a disk portion and circumferentially spaced impact elements extending substantially axially therefrom, pulverizing elements on the 5 inner wall of the pulverizing chamber and disposed in an annular series around the impact elements of the rotor, a ring connecting said impact elements and disposed in close running relation to saidpartition around the opening therein, the 70 disk portion of the rotor being spaced from the inlet end of the pulverizing chamber to provide a substantially unobstructed passage for feeding material to the impactelements of the rotor, and means for driving said rotor and said fan.

4. In a pulverizing machine, the combination of a housing having a fan chamber and a pulverizing chamber with a partition therebetween, said partition having an opening substantially centrally thereof for connecting said chambers, a fan in the fan chamber, a rotor in the pulverizing chamber having a disk portion and circumferentially spaced impact elements extending substantially axially therefrom, said axially extending impact elements being spaced from the inner wall of the pulverizing chamber to provide an annular space for material to be pulverized, pulverizing elements on the inner wall of the pulverizing chamber and disposed in an annular series around the rotor for cooperation with the impact elements thereof, a ring connecting the impact elements of the rotor and disposed in close running relation to said partition around the opening therein, the disk portion of the rotor being spaced from the inlet end of the pulverizing chamber to provide a passage for receiving material to be pulverized and feeding the same to said annular space, and means for driving said rotor and fan.

5. In a pulverizing machine, the combination of a housing having a fan chamber and a pair of pulverizing chambers therein, a partition intermediate the pulverizing chambers and having an opening connecting said chambers, a partition between the fan chamber and the adjacent pulverizing chamber and having an opening connecting said chambers, a pulverizing rotor in one of the pulverizing chambers comprising a disk having substantially axially extending circumferentially spaced impact elements and a ring spaced from said disk and connecting said impact elements, pulverizing elements on the inner wall of said one pulverizing chamber and disposed in an annular series around the impact elements of the rotor, said rotor being disposed with said ring in close running relation to the first mentioned partition and with the impact elements thereof spaced from said pulverizing elements to provide an annular space for material to be pulverized, means for feeding material to said annular space, a pulverizing rotor in the other pulverizing chamber comprising a disk having substantially axially extending circumferentially spaced impact elements, pulverizing elements on the inner wall of said other pulverizing chamber and disposed around the impact elements of the last mentioned rotor inan annular series, said impact elements of the last mentioned rotor being spaced from the pulverizing elements of said inner wall to provide an annular space therebetween for material to be pulverized, said last mentioned rotor being disposed with the ring thereof in close running relation to the second mentioned partition and withthe disk thereof spaced from the first mentioned partition to provide a passage for feeding material to the last mentioned annular space, and a fan operable in said fan chamber whereby the material is caused to pass inwardly through the pulverizing rotors in succession and to pass through each rotor in opposition to centrifugal force.

AUSTIN A. HOLBECK. HALVOR F. HOLBECK. 

